> For the complete documentation index, see [llms.txt](https://docs.metadium.com/en/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.metadium.com/en/api-reference/json-rpc.md).

# Json-RPC

Blockchain information can be read, and transactions can be sent through an RPC server without installing a node. The RPC server operates continuously unless there are maintenance or outage issues.

* Specifications for using the Metadium API are the same as the [Ethereum API](https://github.com/ethereum/execution-apis)  specs.
* Metadium implements the Json-RPC specification on a public End Node, providing a set of methods that dApps can use directly on-chain. Also[ ](https://ethereum.org/en/developers/docs/apis/json-rpc/)it provides the same Json (RFC 4627) standard data format as [Ethereum Json-RPC API](https://ethereum.org/en/developers/docs/apis/json-rpc/).

<table><thead><tr><th width="152">Network</th><th>Type</th><th>URL</th></tr></thead><tbody><tr><td>Mainnet</td><td>HTTP(HTTPS) server endpoint</td><td>https://api.metadium.com/prod</td></tr><tr><td>Mainnet</td><td>WS(WSS) server endpoint</td><td>wss://ws.metadium.com/prod</td></tr><tr><td>Testnet</td><td>HTTP(HTTPS) server endpoint</td><td>https://api.metadium.com/dev</td></tr><tr><td>Testnet</td><td>WS(WSS) server endpoint</td><td>wss://ws.metadium.com/dev</td></tr></tbody></table>